Rope transmission device.



No. 655,281. Patented Aug. 7, I900. 0. SUNDT.

ROPE TRANSMISSION DEVICE.

(Application filed Feb 5, 1900. N 0 ll 0d al Wa' $7266.: as; I n/vanzfol;

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UNITED STATES PATENT OFFICE.

OSCAR SUNDT, OF CLEVELAND, OHIO.

ROPE TRANSMISSION DEVICE SPECIFICATION forming part of Letters Patent No. 655,281, dated August 7, 1900.

Application filed February 5, 1900. Serial No. 3,982. (No model.)

To all 1072,0777, it mag "concern:

Be it known that I, OSCAR SUNDT, a subject of the King of Sweden and Norway, and a resi dent of Cleveland, county of Ouyahoga, and State of Ohio, have invented a new and useful Improvement in Rope Transmission Devices, of which the following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions' My invention relates to driving-drums for rope or cable transmission devices.

In drums of the above-mentioned type the slippage between the cable and pulley periphery may be reduced practically to zero by causing a requisite number of cable-wraps to engage said periphery, the amount of frictional resistance between cable and drum Varying as the number of wraps. It is therefore a universal custom to take several wraps of the cable about a driving-drum, and in order that it may be caused to remain upon the drum periphery each wrap is caused to run in a separate and independent groove which is usually located in planes perpendicular to the drums axis of rotation. Each groove is hence separated from the adjoining groove by a flange, and it is necessary to provide means for transferring each wrap from one groove to the next without crossing said flanges, which would otherwise rapidly become destroyed. This object has heretofore been accomplished by using two independent drums, each provided with a series of contiguous grooves located in planes perpendicular to their respective axes of rotation mounted upon separate and independent shafts, the one shaft being inclined. relatively to the other, passing thecable half-way around one drum, thereupon leading it over to the other, passing half-way around the latter, then back to and half-way around the first,the axis of the inclined shaft, and hence the one axis of rotation, lying in a plane perpendicular to the plane passing through the axis of the other shaft and through the center of the drum. The degree of inclination is made such as to cause the first groove on the second drum to be opposite the second groove of the first drum at the point at which the cable leaves the second drum. In this manner the wraps are transferred from one groove on the firstdriving-drum without crossing the flanges. In my invention, however, I have accomplished the same result by the use of a single drum mounted upon a single shaft, thus reducing the number of wraps, and hence increasing the life of the cable and effecting a marked saving in space, material, shafting, and bearings, such invention consisting of means hereinafter fully described.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting but one of various mechanical forms in which the principle of the invention may be used.

Figure I represents a transverse section of my improved drum and the standards supporting same, taken upon a central plane perpendicular to the axis of the shaft upon which it is mounted, and Fig. II represents an axial cross-section showing the shaft in elevation.

A shaft A is non-rotatively secured and supported in two standards I) b, Fig. II, and is formed or provided midway between said two standards with an eccentric a, having a spherical surface a, which forms a journal for a spherical concave bearing-surface c of one portion 0 of atwo-part drum, aline passing through the center of the sphere of whose spherical surface, surface a is a part, the center of the shaft A'and in a plane perpendicular to the shaft-axis being parallel with the two planes tangent to the drum periphery parallel with the two cable portions respectively approaching and receding from the drum when such two planes are parallel with each other. When such two planes are angularly located relatively to each other, such line bisects the angle formed thereby. Said'drum portion 0 is located within outer portion 0, which is journaled upon each side of the journal at, as shown in Fig. II. The periphery of the outer portion 0 of the drum is provided with a series of recesses c, piercing the rim portion thereof, as shown in Fig. I. The inner portion 0 is formed with a series of projections 0 corresponding in number and location with recesses c. The diameters of the two portions areflmade substantially equal, whereby said projections by virtue of the above-described eccentricity of surface a are caused to project beyond the periphery of portion 0 throughout'halfits circumference and below said periphery throughout the remaining half, as shown in Fig. I. The length of the projections c is made such that they may readily move into and out of recesses c. The width of recesses cis made greater than the width of the projections. The two portions C and 0 hence jointly form the periphery of the complete drum. Each portion is provided with a series of parallel independent grooves c and 0 respectively, which lie in planes perpendicular to the respective axes of the two portions and which are respectively interrupted by the recesses in the periphery of the one portion and the depressions on the periphery of the other portion. Suitable guard-flanges c are formed upon the outer drum portion 0. It is thus seen that the above construction permits of the simultaneous rotation of the two parts which during such rotation may be fixed relatively to each other in the direction of rotation and movable relatively to each other in alateral ora direction transverse to such direction of rotation, each projection c engaging the inner surface of one of the recesses c.

In explanation of the operation of my invention I will assume the direction of rotation to be that indicated by the arrow in Fig. I. The cable is first passed around that part of the drums periphery upon which the projections a fall below the periphery of part 0, thereby being entirely supported at these points by said part and free'from engagement with part 0 and caused to engage the one end groove. The cable is thereupon passed around .the opposite side of the drum and caused to engage the corresponding end groove of the part 0, thereby being entirely supported at these points by the projections 0 The winding is continued, each complete cable-Wrap being supported upon one half the drums periphery by one part of said drum and upon the other half by the other part thereof. The outer portion 0 being driven by means of gearing or other suitable driving means, the inner part 0 assumes an inclined or canted position as a result of the helical movement of the cable. Such position is maintained throughout the rotation of the drum and is made possible by the spherical or universal bearing with which said part is mounted and the consequent oscillatory movement of which it is hence capable. Each wrap is thereby lifted from one groove in one part of the drum during one half the rotation thereof and transferred to a point opposite the next groove in the other part of the drumduring the other part of the revolution, the axes of rotation of the two parts maintaining a constant inclined position relatively to each other.

' Other modes of applying the principle of the mechanism herein disclosed,provir.led the means covered by any one of the following claims be employed.

I therefore particularly point out and dis tinctly claim as my invention 1. The combination of a drum provided with a number of independent grooves,a cable,said

drum engaged by said cable in said grooves,

about the drum-axis and being free from engagement With such part during another portion of such revolution, substantially as set forth.

3. A drum consistingof two parts relatively fixed in and relatively movable in a direction transverse to the direction of rotation of said drum, substantially as set forth.

4. A drum consisting of two parts relatively fixed in the direction of rotation of the drum, the axes of rotation of the respective parts being inclined relatively to each other, substantially as set forth.

5. A drum consisting of two rotative parts mounted upon a common shaft, the axes of rotation of the respective parts being inclined to each other, substantially asset forth.

6. A drum consisting of two rotative parts one mounted within the other and jointly forming the drums periphery, the axes ofrotation of said two parts being inclined'relatively to each other,substantially-as set forth.

7. A drum consisting of two rotative parts, one within the other, the inner mounted upon a universal bearing and having lateraloscil latory movement upon such bearing, substantially as set forth.

8. A drum consisting of two rotative parts one within the other, and mounted upon a common shaft, the bearing of the inner being eccentric relatively to the bearing of the outer part, substantially as set forth. 7

9. A two-part drum,one part mounted within the other, the outer provided with a series of openings in its periphery, he inner provided with a series of projecting portionsld cated in said openings and meansfor causing said projecting portion to extend beyondsaid periphery during a portion of the drumsrotation and for causing them to project below said periphery during another portion of such rotation, substantially as set forth.

Signed by me this 1st day of February, 1900.

OSCAR 'SUNDT.

Attest:

D. T. DAVIES, A. E. MERKEL. 

